Fabrik augsburg-nuernberg



June 30, W5,

G. PIELSTICIK COMPRESSED AIR STARTING DEVICE FOR INTERNAL COMBUSTIONENGINES Filed March 10, 1923 PatentedJime 30, 1925.

UNITED STATES GUSTAV PIELSTICK, OF AUGSBURG, GERMANY, ASSIGNOR TO THEFIRM; CNEN- FABRIK AUGSBURG-NUERNBERG, AKTIENGESELLSCHAFT, OF AUGSBURG,GER- MANY, A CORPORATION OF GERMANY.

COM PRESSED-AIR STARTING DEVICE FOR INTERNAL-COMBUSTIQN ENGINES.

Application filed March 10, 1923. Serial No. 624 218.

To all whom it may concern:

Be it known that I, GUSTAV PIELSTICK, a citizen of the German Republic,and a resident of 7 Stadtbachstrasse, Augsburg, Bavaria, Germany, haveinvented certain new and useful Improvements in Compressed- Air StartingDevices for Internal-Combustion' Engines, of which the following is aspecification.

This invention relates to a compressed air starting device for internalcombustion engines, and its main object is the provision of improved aircontrolled means to facilitate the actuation of the starting valveduring the starting period.

With this object in view, the invention involves the provision of alever for actuating the starting valve'whiclnis continuously rocked by acam and cam lever. The actuatin lever engages the stem of the startingva ve, but under ordinary conditions the connection between theactuating lever and the stem of the valve is such that the rockingmovement of the lever does not affect the position of the valve. Aircontrol means, however, are provided for establishing a differentoperative connection between the actuating lever and the valve, so thatwhen these means are effective the rocking movement of the actuatinglever produced by the cam lever causes the valve to open and close incorrespondence with the movement of the cam lever. When the engine isrunning on fuel these air control means are restored to their originalpositions so that the valve-actuating lever may again rock withoutactuating the air valve. k

Further objects and advantages of the invention will beapparent from thefollowing description of the appended drawing, in which Fig. 1 is avertical section, with parts shown in elevation, of the newstartingdevice,

Fig 1 is a cross section through the valve spindle on the .line AB'ofFig. 1,

Fig. 2 shows a slightly modified form of the valve operating rockinglever,

Fig. 3 is a view similar to Fig. 1, showing the relative position of thedifferent parts of the mechanism during the starting operation.

Referring first to Fig. 1: a denotes the cylinder head of an internalcombustion engine having its starting valve 6 arranged in the usualmanner. Said valve is provided with a relief portion 0 and is normallyheld closed by the action of a compressionthrough which the two levers gand it pass; I

the former being the valve operating rocking lever pivoted at z'tothegcam lever 72:. This cam lever is in the shape-of a twoarmed leverand is controlled by a roller Z and cam m. The auxiliary lever 72. isfulcrumed to a lug n of the cam lever and, with one of its ends, isconnected to lever g by means of a link 0 so that a closed link drive isformed in this Way consisting of the four members 11., g, 0, h. Theuppermost portion of the valve spindle is-made to form a cylinto slideloosely and to rest upon lever h.

The valve spindle isprovided with a passvarious parts of the device areat rest and in the position shown in Fig. 1. -Valve b is held closed byits spring (Z and there isno compressed air in the cylinder to act on'der p within which a piston'q is arranged the piston which, therefore,only rests with its own weight upon lever 72.. It will be seen that inthis position of the parts, lever g is able to follow the movement ofthe cam lever by rocking on itssupport in the slot same time alsopreventing the free end of lever g from moving aside when being rocked.The pivot 23 now serves as a fulcrum on which lever 9 may rock under theaction of the cam lever k and thereby open the valve by pressing itdownwardly against the resistance of its spring d. This action isrepeated at every rotationof the cam shaft as long as compressed airfisadmitted, i. e. until the engine begins to work on fuel.

Lever h is p'rovided'with a set screw za adapted to bear against theshorter arm' of cam lever is and to thereby adjust roller 1 in relationto cam m. A springofastened to the lever L and acting on an extended armof lever It serves to relieve the, cam to some extent during the normalwork of the engine.

\Vhat I claim is 1. In a compressed air starting device'for internalcombustion engines the combination with a starting valve,a cam and a camlever, of a valve operating rocking lever pivoted to the cam lever andresting looselyupon a:

portion of the valve spindle, an auxiliary lever, means to connect boththe latter levers .at'their free ends, a cylinder on the valve spindle,a loosely mounted piston in said cylinder, passage ways for compressedair in the valve spindle terminating in the cylinder, said pistonadapted to press said auxiliary lever against the-valve spindle.

2. In a compressed air starting device for internal combustion engines,in combination with a starting valve, a cam and a cam lever, of a valveoperating rocking lever pivotedto the cam lever and passing looselythrough a slot in the valve spindle, an auxilia lever pivoted to a lugon the cam lever an passing through another slot in the valve spindle, alink to connect the freeends of both the latter levers, a cylinder onthe valve spindle, a loosely slidable piston in said cylinder,-anairpassage in the valve spindle terminating in the cylinder at a pointabove the piston, and a spring to normally keep the valve closed, saidpiston, when under pressure, adapted to press said auxiliary leveragainst the valve spindle.

3. In a compressed air starting device for internal combustion engines,a valve operating closed link drive consisting of. a cam lever, aloosely mounted rocking lever pivotally connected at one of its ends tothe cam lever, an auxiliary lever also pivotally connected to the camlever and disposed approximately parallel to the said rocking lever,pneumatic means to block saidau xiliary lever during the starting periodof the engine, a link to connect the free ends of both the latter leversand to serve as a fulcrum for the rocking lever when the auxiliary leveris. in its blocked position, and

' means to rock said rocking lever on its link connection to depress thevalve against the resistance of the valve spring.

' 4. In a compressed air starting device for internal combustionengines, a valve operating closed link drive consisting of a cam. lever,a loosely 'mounted rocking lever pivotally connected at one of its endsto the cam lever, an auxiliary lever also pivotally connected to the camlever, a cylinder carried by the valve spindle and in communication-withthe starting air conduit by means of. a passage in the valve spindle, apiston mounted to loosely slide in the cylinder and to block theauxiliary lever during the starting period of the engine, a link toconnect the free ends of both the said levers, latter link normallypermitting the rocking lever to move under the action of the cam lever,without actuating the valve and to serve as a fulcrum for the rockinglever when the auxiliary lever is in its blocked position, and

means to rock the rocking lever on said fulcrumin order to depress thevalve.

5. In a compressed air starting device for internal combustion engines,a valve operating closed link drive consisting of a cam lever, a looselymounted rocking lever pivoted at one of its ends to the cam lever, anauxiliary lever also pivotally connected to the cam lever, a set screwbetween the cam lever and the auxiliary lever to adjust the positionvofthe cam roller, pneumatic means to block the auxiliary lever during thestart ing period of the engine, a link pivotally connecting the freeends of the said rocking,

and auxiliary levers and to serve as a fulcrum for the rocking leverwhen the auxiliary lever is in its blocked position.

6. Ina compressed air starting device for internal combustion engines, avalve operatlever, a loosely mounted rocking lever' pivoted at one ofits ends to the cam lever an auxiliary lever also pivotally connectedGUSTAV PIELSTIOK.

Witnesses:

Amxm PHILIPPOFF, ALEXANDER on Sam.

'ing closed link drive consisting 'ofa cam

